Next time if you want an question you can tag me in post so i got notified.
Charity gig is for giftgiver. Giftgiver.io site delegate 10 hp to new comers thus you are supporting the cause of helping new people on hive. Since you are new your self try doing standard missions and earn starbits to buy nfts so you can earn more starbits and easier.
If there is some other use case specially 0.1 gift then i am unaware of it. But i think its a charity gig from which they buy nfts to gift to people. You can see winners in home page. In short i want to say is do standard missions